/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.wicketstuff.shiro.example.sprhib.security;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.crypto.hash.Sha256Hash;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.wicketstuff.shiro.example.sprhib.dao.UserDAO;
import org.wicketstuff.shiro.example.sprhib.model.Role;
import org.wicketstuff.shiro.example.sprhib.model.User;

/**
 * The Spring/Hibernate sample application's one and only configured Apache Shiro Realm.
 * 
 * <p>
 * Because a Realm is really just a security-specific DAO, we could have just made Hibernate calls
 * directly in the implementation and named it a 'HibernateRealm' or something similar.
 * </p>
 * 
 * <p>
 * But we've decided to make the calls to the database using a UserDAO, since a DAO would be used in
 * other areas of a 'real' application in addition to here. We felt it better to use that same DAO
 * to show code re-use.
 * </p>
 */
@Component
public class SampleRealm extends AuthorizingRealm
{

	protected UserDAO userDAO = null;

	public SampleRealm()
	{
		setName("SampleRealm"); // This name must match the name in the User class's getPrincipals()
// method
		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher();
		matcher.setHashAlgorithmName(Sha256Hash.ALGORITHM_NAME);
		setCredentialsMatcher(matcher);
	}

	@Autowired
	public void setUserDAO(UserDAO userDAO)
	{
		this.userDAO = userDAO;
	}

	@Override
	protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken)
		throws AuthenticationException
	{
		UsernamePasswordToken token = (UsernamePasswordToken)authcToken;
		User user = userDAO.findUser(token.getUsername());
		if (user != null)
		{
			return new SimpleAuthenticationInfo(user.getId(), user.getPassword(), getName());
		}
		else
		{
			return null;
		}
	}


	@Override
	protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals)
	{
		Long userId = (Long)principals.fromRealm(getName()).iterator().next();
		User user = userDAO.getUser(userId);
		if (user != null)
		{
			SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
			for (Role role : user.getRoles())
			{
				info.addRole(role.getName());
				info.addStringPermissions(role.getPermissions());
			}
			return info;
		}
		else
		{
			return null;
		}
	}

}
